[文本处理] 请教批处理如何把数字+字母自定义生成多少位数？

@echo off & setlocal EnableDelayedExpansion
cd/d "%~dp0"

:FIRST
set n=-1
for %%a in (a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9) do (
	set /a n+=1
	set "str!n!=%%a"
)
set /a n0=%random%%%26,n1=%random%%%36,n2=%random%%%36,n3=%random%%%36
set /a n4=%random%%%36,n5=%random%%%36,n6=%random%%%36

call echo %%str!n0!%%%%str!n1!%%%%str!n2!%%%%str!n3!%%%%str!n4!%%%%str!n5!%%%%str!n6!%%@126.com
timeout /t 2 /nobreak >nul
goto FIRST
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@echo off & setlocal EnableDelayedExpansion
cd/d "%~dp0"

:FIRST
set n=-1
for %%a in (q w e r t y u i o p a s d f g h j k l z x c v b n m 0 1 2 3 4 5 6 7 8 9) do (
	set /a n+=1
	set "str!n!=%%a"
)
set /a n0=%random%%%26,n1=%random%%%36,n2=%random%%%36,n3=%random%%%36
set /a n4=%random%%%36,n5=%random%%%36,n6=%random%%%36
echo %%str!n1!%% %%str!n2!%% %%str!n3!%% %%str!n4!%% %%str!n5!%% %%str!n6!%% | findstr "[0-9]">nul 2>&1 || goto FIRST
call echo %%str!n0!%%%%str!n1!%%%%str!n2!%%%%str!n3!%%%%str!n4!%%%%str!n5!%%%%str!n6!%%@126.com>>email.txt
goto FIRST
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 && set /a a+=1 && echo !a!
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@echo off & setlocal EnableDelayedExpansion
cd/d "%~dp0"

:FIRST
set n=-1
for %%a in (q w e r t y u i o p a s d f g h j k l z x c v b n m 0 1 2 3 4 5 6 7 8 9) do (set /a n+=1 & set "str!n!=%%a")
set /a n0=%random%%%26,n1=%random%%%36,n2=%random%%%36,n3=%random%%%36,n4=%random%%%36,n5=%random%%%36,n6=%random%%%36
echo %%str!n1!%% %%str!n2!%% %%str!n3!%% %%str!n4!%% %%str!n5!%% %%str!n6!%% | findstr "[0-9]">nul 2>&1 || goto FIRST
call set "name=%%str!n0!%%%%str!n1!%%%%str!n2!%%%%str!n3!%%%%str!n4!%%%%str!n5!%%%%str!n6!%%"
set /a a+=1
call set/p=!a! !name!@126.com <nul & echo !name!@126.com>>email.txt & echo;
if !a! geq 10000 goto END
goto FIRST
:END
pause
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@echo off & setlocal EnableDelayedExpansion
cd/d "%~dp0"
set /a n=-1,m=1,count=10000
for %%a in (q w e r t y u i o p a s d f g h j k l z x c v b n m 0 1 2 3 4 5 6 7 8 9) do (set /a n+=1 & set "#!n!=%%a")
(for /l %%a in () do (
    set /a n0=!random!%%26,n1=!random!%%36,n2=!random!%%36,n3=!random!%%36,n4=!random!%%36,n5=!random!%%36,n6=!random!%%36
    set "s="
    for /l %%b in (0 1 6) do (for %%c in (!n%%b!) do set s=!s!!#%%c!)
    if !m! leq %count% (
        for /f "delims=0123456789" %%b in ("!s!") do (if "%%~b" neq "!s!" (set /a m+=1&echo;!s!@126.com))
    ) else exit
))>"email.txt"
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